WO1995031290A1

WO1995031290A1 - Spraying gun

Info

Publication number: WO1995031290A1
Application number: PCT/EP1995/001787
Authority: WO
Inventors: Werner Morck
Original assignee: Bruno Jesswein Kunststofftechnik
Priority date: 1994-05-13
Filing date: 1995-05-11
Publication date: 1995-11-23
Also published as: EP0765194B1; DE4416939A1; EP0765194A1; US5875971A; DE59505718D1; AU2563495A

Abstract

A spraying gun has a handle part (6) and a connection part (3) for a housing (2) with a pressurised can. The connection part (3) is provided with a check valve and the housing (2) receives a tube (10) that carries a nozzle (11) at its free end. A spring-loaded injection needle (12) presses the opening of the nozzle (11) and extends into the tube (10). The injection needle may be actuated by means of a swivelling lever (9) mounted in the housing. In order to vary the position of the pressurised can in relation to the handle part (6) and to hold it in position with a simplified design of the spraying gun, the part (17) of the housing that carries the pressurised can connection part (3) is designed to rotate around the axis (19) of the injection needle (12) towards the part (18) of the housing that carries the handle part (6).

Description

Spri tzpi stol e

The invention relates to a spray gun with a handle part and a housing having a check valve provided with a connecting part for a pressure cell, which accommodates a nozzle tube carrying a nozzle at the free end, into which a nozzle opening acts upon the opening of the nozzle , spring-loaded nozzle needle which can be actuated via a pivot lever mounted on the housing. Such a spray gun is particularly suitable for the application of plastic sealing foams, for example polyurethane foams.

From DE 37 10 395 AI i such Spri st known zpistole be ^¬. The Anschlußtei l is in one piece and firmly connected to the Ge ^¬ housing, and thus the position of the pressure box is fixed to the handle portion of the housing and not Variegated Lich. Depending on the nature of the medium in the pressure cell, it may erforder ^¬ i l be that the pressure cell has to take a angular orientation to the horizontal. Also, the Pl atzverh ltni sse at the site of the spray gun sometimes make it erforder ^¬ Lich that the pressure cell to the handle part, a ^¬ must take another position, since at a fixed orientation, the handling of the otpimale Spri tzp.i stol e is not reached. The inclined pressure can also causes a tilting moment on the wrist via the handle part, which leads to an overuse of the wrist and partly the support by the second hand is also required.

The invention has for its object to provide a spray gun of the type mentioned, in which the position of the pressure can with respect to the handle part can be adjusted with a simple structure of the spray gun. This object is achieved in that the housing part carrying the connection part for the pressure cell is designed to be rotatable about the axis of the nozzle needle relative to the housing part carrying the handle part.

As a result of this measure, the position of the pressure cell can be quickly adapted to the required positional conditions, which ensures fast work with minimal stress on the user.

It is understood that the rotatability of the housing part carrying the connecting part relative to the housing part carrying the handle part is limited to the extent that a certain amount of force is required to change the position. This is achieved, for example, by a frictional bracing of the housing part carrying the connection part on the housing part carrying the handle part or also by the formation of latching positions.

According to an advantageous embodiment of the invention, the connection part-carrying housing part has a lug with a snap ring which is inserted into a bore of the housing part carrying the handle part, the snap ring arranged in a groove of the lug opening up behind a shoulder of the housing part carrying the handle part and thus axially defines the housing parts. The precise and simple assembly of the housing parts is ensured by this arrangement, only the required degrees of freedom of the housing parts being available to one another.

In the event of a blockage in the nozzle tube, the function of the spray gun must be restored. For this purpose, after easy removal of the nozzle tube, it must be cleaned or replaced in a simple manner. In order to achieve this, according to an advantageous development of the invention, the housing part carrying the connecting part projects through the nozzle needle and has at its end the overlying side a receiving device for the nozzle tube and carries a union nut with which the nozzle tube is clamped to the housing part.

According to an advantageous embodiment of the invention, a locking element is arranged between the housing part carrying the connecting part and the housing part carrying the handle part. This measure ensures that the Me ^¬ dium-pressure cell remains in the set locked position, the number of locking positions can be produced belie¬ big, so for each condition the right egg nstel 1 wi nkel possible.

The two housing parts are already axially fixed to one another by the snap ring. The housing parts thus have a precisely defined position relative to one another, which makes it possible for many striking locking points to be realized on the circumference. For this purpose, preferably axially acting latching elements are present on the housing part carrying the handle part, which cooperate with latching notches attached to the housing part carrying the connecting part. In order to achieve a small number of individual parts, according to a further development of the invention, the latching element consists of at least one latching spring tapered on the housing part supporting the handle part, the latching projection of which protrudes beyond the front wall of the bore receiving the shoulder, and the latching notches cooperating with the latching springs are located on a circumferential shoulder on the housing part carrying the connection part, from which the extension extends into the bore.

A variation of the latching forces is possible if, according to a further advantageous embodiment, the latching element consists of at least one spring-loaded, inserted in a holding base and protrudes through a guide hole. the stop block, wherein the support base is fixed in a Fen ^¬ art in the handle bearing housing part and cooperating with the stop block notches are located on one end face of the approach tion in the Boh ^¬ of the handle bearing housing part is inserted. The locking force can thus only be influenced by changing the Federe.le entes under the locking stone. By inserting an approach with unte schiedlicher number of notches, a different number can ^¬ Liche these measures of detent positions provided the wer¬.

A saving of the snap ring and thus a more cost-effective production is given according to an advantageous embodiment if the retaining socket inserted in the window of the housing part 1 carrying the connecting part engages in the groove in the attachment of the housing part carrying the connecting part and axially fixes the housing parts , wherein the notches with which the spring-loaded latching block located in the holding base works together are recessed in a groove flank of the groove.

In an alternative embodiment of the invention, radially acting latching elements are attached between the housing part carrying the handle part and the housing part carrying the connecting part. This measure relieves the axial fixing of the two housing parts to one another, since the latching forces do not act in the axial direction. It is easier to influence the locking forces, since these cannot be seen with the axial friction forces.

An oak design of the latching forces is possible according to an advantageous further development of the invention, if preferably at the base of the housing part carrying the connecting part there is a detent spring which interacts with the notches located in the bore of the housing part carrying the grip part.

In a low-cost production type, which also flußnahme A ^¬ allows the cogging forces, is located in a further embodiment in the neck of the connecting part bearing the housing part a spring groove in which the steel formed from Feder¬, at least one locking projection having detent spring by a fixing element fixes is.

According to a further advantageous embodiment, at the base of the housing part carrying the connection part there is a circumferential locking groove which has locking notches and which cooperates with a spring-loaded locking block guided in the housing part carrying the handle part. The implementation of a larger number of locking positions with a simple influence on the locking force is ensured by this measure.

A reduction in parts and thus a more economical production is given by the saving of the snap ring. For this purpose, the locking notches in the groove are expediently incorporated in the attachment of the housing part carrying the connecting part, the locking tips being recessed deeper than the diameter of the attachment, and by a side flank of the insert which is inserted into the groove and carries the handle part spring-loaded locking block guided in the housing part, the housing parts are axially fixed.

The idea on which the invention is based is explained in more detail in the following description with reference to several exemplary embodiments which are shown in the drawing. It shows :

1 is a side view of a spray gun according to the invention;

2 is a view of the spray gun of FIG. 1 in the direction of arrow II,

3 is a partial section of the detail II I of FIG. 1 on an enlarged scale,

4 shows a section through FIG. 3 along the line IV-IV,

5 shows an alternative embodiment according to FIG. 3,

6 shows a section through FIG. 5 along the line VI-VI,

7 shows an alternative embodiment according to FIG. 3,

8 shows a section through FIG. 7 along the line VIII-VII I,

9 shows an alternative embodiment according to FIG. 7,

Fig. 10 is a section through Fig. 9 along the line X-X and

Fig. 11 is a partial section of the detail III according to

Fig. 1 on an enlarged scale a further embodiment of the invention.

On the cylindrical housing 2 of the spray gun according to FIG. 1, which is provided on the outside with side-by-side flattenings 1, on the one hand there is a connection part l 3 for receiving a medium-pressure can not shown and on the other hand, a handle part 6 is formed on the underside. Opposite the handle part 6 there is a web 7 on the upper side of the housing 2, which serves to suspend the spray gun. The handle part 6 is assigned a pivoted lever 9, which is mounted on a bearing pin 8 in the housing 2 and via which a spring-loaded nozzle needle 12 extends through the housing 2 and a nozzle tube 10 with nozzle 11 attached to the housing 2 can be actuated. The nozzle tube 10 is divided by a step 13 into a receiving area ch 4 assigned to the housing 2 and a nozzle area 5 assigned to the nozzle 11. The adjustment path of the nozzle needle 12 can be changed via an adjusting screw 14 protruding from the rear of the housing 2. The front and rear of the cylindrical housing 2 are each closed by corresponding union nuts 15 and 16, respectively. The union nut 15 also carries the thread for the adjusting screw 14. The union nut 16 fixes the nozzle tube 10 on the housing 2. At the dividing line 20, the housing 2 is separated into the housing part 17 with the connecting part 3 and the housing part 18 with the handle part 6. The housing part 17 carrying the connection part 3 for the medium pressure cell 3 is rotatable about the axis 19 of the nozzle needle 12 to the housing part 18 carrying the handle part 6. When configured as a locking system, the housing part 17 takes up the locking positions 26 with the connecting part 3 (FIG. 2).

On the housing part 17 carrying the connection part 3 there is an extension 22 which carries a snap ring 21 in a groove 24. A bore 23 is inserted in the housing part 18 carrying the grip part 6, into which the extension 22 carrying the snap ring 21 is inserted. The housing part 18 has a shoulder 25 which is formed by the meeting of the bore 23 with a housing bore 27. When inserting the attachment 22 provided with the snap ring 21 into the O

Bore 23, which is facilitated by the chamfer 28, the snap ring 21 springs up behind the shoulder 25 and thus axially fixes the housing parts 17 and 18. Through the attachment bore 29, the nozzle needle 12 is guided both through the attachment 22 and through the housing part 17. In the housing part 17 there is also a sliding seat (not shown) for the nozzle needle 12, which at the same time represents the rear boundary of the attachment hole 29, so that no foaming agent can pass into the interior of the housing part 18. Appropriate seals are provided on the sliding seat for this purpose. The nozzle needle 12 thus extends through the housing part 17 carrying the connecting part 3 and extends to the nozzle 11 on the nozzle tube 10. On the side opposite the attachment 22, the housing part 17 has a receiving device for the nozzle tube 10. By means of the union nut 16, the nozzle tube 10 clamped on the housing part 17. The receiving device for the nozzle tube 10 can be designed as shown in DE 37 10 395 AI.

A latching system 30 is arranged between the housing part 17 carrying the connecting part 3 and the housing part 18 carrying the handle part 6. An axially acting locking element 31 is present on the housing part 18 carrying the handle part 6 and interacts with locking notches 32 attached to the housing part 17 carrying the handle part 3.

3, the detent element 31 consists of at least one detent spring 33 molded onto the housing part 18 carrying the grip part 6. A chamber 37 in the housing part 18 ensures that the detent spring 33 is sprayed free and can thus spring. The Rastvo jump 34 of the detent spring 33 protrudes beyond the front wall 35 of the housing part 18 and thus the bore 23 receiving the approach 22. There are locking notches 32 on a circumferential shoulder 36 on the housing part 17 carrying the connecting part 3. The shoulder 22 extends from the shoulder 36 into the bore 23 of the housing part 18. The locking projections projecting beyond the front wall 35 Jumps 34 of the detent springs 33 cooperate with detent notches 32 present in the shoulder 36 and thus fix the detent positions 1. By varying the thickness of the latching springs and by changing the projection of the latching projection over the front wall, the latching force can be influenced. If the housing part 17 is rotated about the axis 19, the detent spring 33 resiliently springs into the chamber 37. The respective adjustment path is influenced by the detent notches 32. It is only in the next notch 32 that the detent 1 and 26 are again fixed after the detent spring 33 has sprung open, the detent projection 34 coming into contact with the detent notch 32.

5, the locking element 31 consists of a spring-loaded locking block 40, which is inserted in a holding base 38. The holding base 38 has a guide bore 39 into which the locking block slides. A compression spring 44 is inserted in the locking block 40 and is supported on a wall of the holding base 38, as a result of which the locking block 40 is pressed in the direction of the locking notches 42. A spring-back clip 45 enables the locking block 40 to be inserted axially into the guide bore 39 and prevents the locking block 40 from falling out of the holding base 38. The holding base 38 is fixed in a window 41 in the housing part 18 carrying the grip part 6 by means of locking clips 46. The latching force is thus supported via the latching block 40, the compression spring 44 and via the holding base 38 on the housing part 18. By changing the angle of the latching notches 42 or the latching block 40 and changing the compression spring, the latching force is influenced.

According to an alternative, not shown in the drawing, the holding base 38 engages in the groove 24 in the shoulder 22 of the housing part 17. The holding base 38 is over the Rastklipse 46 defined in the housing part 18, the width of the holding base 38 corresponds to the width of the groove 24. In one of the groove flanks of the groove 24, the notches inserted ^¬ are blank, which cooperates located in the support base 38 federbe ^¬ weighed stop block 40th The holding base 38 thus replaces the snap ring 21 and ensures that the housing parts 17, 18 are axially fixed to one another.

7 to 9, radially acting latching elements 30 are attached between the housing part 18 carrying the handle part 6 and the housing part 17 carrying the connecting part 3. FIGS. 7 and 8 show an alternative in which a detent spring 47 is present on the shoulder 22 of the housing part 17 carrying the connecting part 3. Locking notches 48 are arranged in the bore 23 of the housing part 18 carrying the grip part 6. The detent spring 47 of the housing part 17 interacts with the notches 48 of the ^' housing part 18. A spring groove 49 is embedded in the neck 22 of the housing part 17. In the spring groove 49 there is a locking spring 47 formed from spring steel and having two locking projections 50. The locking spring 47 is fixed in the spring groove 49 by a fastening element 51.

FIGS. 9 and 10 show a further exemplary embodiment. At the shoulder 22 of the housing part 17, there is a running locking groove 53. Locking notches 52 are incorporated in the locking groove 53. A dome 55, which is closed by a plate 57 and has a guide bore 56 for a spring-loaded locking block 54, is arranged on the housing part 18. The compression spring 58 is supported on the plate 57 and presses the locking block 54 in the direction of the locking notches 52 on the neck 22. By changing the angle of the locking notches 52 and the locking block 54 and by varying the compression spring 58, the locking force can be influenced. In one embodiment, not shown in the drawing, the notches 52 are incorporated in the groove 24 in the shoulder 22 of the housing part 17 carrying the connecting part 3. The latching tips 59 are recessed deeper than the diameter of the extension 22. The housing parts 17 and 18 are axially fixed by a side flank of the spring-loaded latching block 54 guided in the dome 55 and inserted into the groove 24. Thus, the snap ring 21 is again dispensed with. The locking block 54 has the width of the locking groove 53.

11 shows a further embodiment of the invention, in which the rotatable design of the housing part carrying the connection part for the pressure cell is not based on the arrangement of latching elements, but on the frictional mounting of the projection 22 of the housing part 17 carrying the connection part 3 in the bore 23 of the housing part 18 carrying the handle part 6 is based. The extension 22 is fitted into the bore 23 such that the housing part 17 can only be rotated with the connecting part 3 when a minimum force is used; as a result, the connection part 3 with the pressurized can remains in the selected position relative to the spray gun until this position is changed by renewed force. Otherwise, the reference symbols denote the same positions as in FIG. 3.

In the spray gun according to the invention, the foaming agent passes from the pressure cell (not shown) via the connection part 3 into the interior of the housing part 17, which is closed off against the housing part 18 carrying the grip part 6 by a partition wall through which the nozzle needle 12 is centrally managed. It is understood that suitable sealing elements are present, which prevent the introduction of foaming agent into the interior of the housing part 18. The foaming agent can move forward through the i 2

Enter the interior of the housing part 17 into the nozzle tube 10. In the rest position of the nozzle needle 12, the nozzle 11 remains closed, but is released when the pivot lever 9 is actuated by withdrawing the nozzle needle 12.

Claims

Spray gun, in particular for the discharge of plastic foams from pressure cans, with a grip part and a housing having a connection part for a pressure cell provided with a check valve, which housing accommodates a nozzle tube carrying a nozzle at the free end, into which a nozzle acting on the opening of the nozzle is accommodated spring-loaded nozzle needle extends, the betätig¬ a mounted on the housing pivoting lever bar, characterized in that the connecting ^¬ part (3) for the pressure box housing part bearing (17) about the axis (19) of the nozzle needle (12) to the the handle part (6) carrying the housing part (18) is rotatable.

Spray gun according to Claim 1, characterized in that the housing part (17) carrying the connecting part (3) has a shoulder (22) provided with a snap ring (21) which fits into a bore (23) in the housing part (18) carrying the handle part (6) ) is used, the snap ring (21) arranged in a groove (24) of the extension (22) opening behind a shoulder (25) of the housing part (18) carrying the handle part (6) and thus the housing parts (17, 18) axially specifies.

Spray gun according to one of Claims 1 or 2, characterized in that the housing part (17) carrying the connection part (3) is penetrated by the nozzle needle (12), and on its side opposite the attachment (22) there is a receptacle for the nozzle tube ( 10) has and a union nut (16) with which the nozzle tube (10) on the housing part (17) is clamped.

Spritzpi stole _, according to one of claims 1 to 3, characterized in that between the housing part (17) carrying the connecting part (3) and the housing part (18) carrying the handle part (6) a detent system (30) is arranged i st.

Spray gun according to one of claims 1 to 4, characterized in that on the housing part (18) carrying the grip part (6) there is at least one axially irking locking element (31) which is connected to the housing part ( ^' ) carrying the connecting part (3). 17) attached notches (32) cooperates.

Spray gun according to one of claims 1 to 5, characterized in that the latching element (31) consists of at least one latching spring (33) molded onto the housing part (18) carrying the handle part (6), the latching projection (34) of which extends over the front wall (35) protrudes the bore (23) receiving the shoulder (22), and the locking notches (32) cooperating with the locking spring (33) rest on a circumferential shoulder (36) on the housing part (17) carrying the connecting part (3) are located, from which the extension (22) extends into the bore (23).

Spray gun according to one of claims 1 to 5, characterized in that the latching element (31) consists of at least one spring-loaded, in a holding base (38) inserted and this through a guide hole (39) protruding locking block (40), the Holding base (38) is fastened in a window (41) in the housing part (18) carrying the handle part (6), and which with The locking notches (42) interacting with the locking stone (40) are located on an end face (43) of the extension (22) which is inserted into the bore (23) of the housing part (18) carrying the handle part (6).

8. Spray gun according to one of claims 1, 3 to 5 and 7, characterized in that in the groove (24) in the An¬ approach (22) of the connecting part (3) supporting housing ^¬ part (17) in the window ( 41) of the housing part 1 (18), which carries the handle part (6), engages the holding base (38) and axially fixes the housing parts (17, 18), the notches with which recesses are embedded in a groove flank of the groove (24) the spring-loaded locking block (40) located in the holding base (38) works together.

9. Spray gun according to one of claims 1 to 4, characterized gekennzei chnet that radially acting latching elements (30) are attached between the handle part (6) carrying the housing part (18) and the housing part (17) carrying the connecting part (3) .

10. Spray gun according to claim 9, characterized in that on the extension (22) of the connecting part (3) carrying the housing part (17) there is a detent spring (47) which carries in the bore (23) of the handle part (6) Housing part (18) located notches (48) cooperates.

11. Spray gun according to one of claims 9 to 10, DA by in that of the connecting part (3) carrying ^Hous' useteiles (17) Fe¬ the groove (49) is located in the neck (22) in which the spring steel shaped, having at least one locking projection (50) Latch spring (47) by a fastening element (51) fi xi ert i st.

12. Spray gun according to claim 9, characterized in that there is at the shoulder (22) of the connecting part (3) tra ^¬ gene housing part (17) has a locking notches (52) having circumferential locking groove (53) which with a in Handle part (6) carrying housing part (18) guided, spring-loaded locking block (54) cooperates.

13. Spray gun according to claim 1, 3 to 5, 9, 10, characterized gekennzei that the locking notches (52) in the groove (24) in the neck (22) of the connecting part (3) carrying housing part 1 it (17th ) are incorporated, the latching tips (59) being recessed deeper than the diameter of the attachment (22) and by a side flank of the housing part (18) inserted into the groove (24) and carrying the handle part (6) guided, spring-loaded locking block (54), the housing parts (17, 18) are axially fixed.